I bypass the minor "tricky" statements - no problem to identify the doors (and no problemas with the knobs). I try to see he questions as fair as logical.
So, it seems a matter of determine slices of time (8 unknown and 2 known - 10 slices). And to measure time we need a reference. So we can...
A few years ago a tryed to solve this problem. A got some reasonable solutions and one very good solution (I think the central question is to obtain a accurate way to masure time) but I don´t know if it´s the best one. This problem is from sigmasociety.com:
An Arab man and an Israeli woman...